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<h2>Ke thua - da hinh</h2>
khi ko khai bao phuong thuc khoi tao nao thi trinh bien dich se tao ra 1 phthuc khoi tao mac dinh
khi t tao 1 phthuc khoi tao nao do thi trinh bien dich se ko tao ra 1 phthuc khoi tap nao nua


ke thua
    cach ghi de phuong thuc khoi tao
    cach goi phuong thuc khoi tao, phuong thuc o lop cha
da hinh
	them tu khoa virtual vao phuong thuc muon da hinh va them ovrride vao khai bao
	phuong thuc muon ghi de o lop con

phan biet new va override
	phuong thuc new se khong override phuong thuc o lop cha // xem vi du da hinh va thay the new va override de hieu
	phuong thuc override se ghi de phuong thuc o lop cha
	khai bao override thi no se khong tim kiem phuong thuc do o cay phan cap ke thua
Lop truu tuong
	them abstract vao truoc class va truoc method
	qui tac ve lop truu tuong tuong tu nhu trong java
Lop co lap
	thay tu khoa abstract bang tu khoa sealed
	khong the ke thuc lop co lap
boxing va unboxing
   dua int ve doi tuong Int la boxing (ngam dinh)
   dua doi tuong Int vve int la unboxing, phai duoc thuc hien tuong minh
Các lop long nhau
   lop trong la nested class, lop ngoai la outer class

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